package com.qiang.util;

import java.util.regex.Matcher;
import java.util.regex.Pattern;

/**
 * @package: com.qiang.util
 * @title: SnowFlakeShortUrl
 * @projectName: burning
 * @description: 分布式ID生成,雪花算法
 * https://mp.weixin.qq.com/s?biz=MjM5NzMyMjAwMA==&mid=2651486934&idx=2&sn=7a5e007def77f13b501c5fc3683f058f&chksm=bd2516a98a529fbff4f7c967d6a2ec6d44ae7ca1f2cb4ca6a0ffb4bd5235bb66ae126a1fdd13&scene=126&sessionid=1586835050&key=0dc261323fd7b317597b76b0b6bfcc48b414fabf92de225653df00f912c14451f07242d99cfc091d8b2682bfb739fa265f5394986d5b417525b35e6ae6ae7c0d24dfa4bb2f34aac5afc069e8d6d5de47&ascene=1&uin=NTQ0NzcwMTc1&devicetype=Windows+10&version=62080079&lang=zh_CN&exportkey=AZm%2B88MY5StHrHJnhOMfzAw%3D&pass_ticket=jiWHCxYuVMkkLzCEGPCb3i6S25YtWScLyRhbDTMoFSjNaJ3spjr%2FU54hH8BNlp%2FX
 * @author zhuhongqiang3
 * @date:  2020-04-15 9:45
 * @version: V1.0
 * @retrun com.qiang.util.burning
 */
public class SnowFlakeShortUrl {
    /**
     * 起始的时间戳
     */
    private final static long START_TIMESTAMP = 1480166465631L;

    /**
     * 每一部分占用的位数
     */
    private final static long SEQUENCE_BIT = 12;   //序列号占用的位数
    private final static long MACHINE_BIT = 5;     //机器标识占用的位数
    private final static long DATA_CENTER_BIT = 5; //数据中心占用的位数

    /**
     * 每一部分的最大值
     */
    private final static long MAX_SEQUENCE = -1L ^ (-1L << SEQUENCE_BIT);
    private final static long MAX_MACHINE_NUM = -1L ^ (-1L << MACHINE_BIT);
    private final static long MAX_DATA_CENTER_NUM = -1L ^ (-1L << DATA_CENTER_BIT);

    /**
     * 每一部分向左的位移
     */
    private final static long MACHINE_LEFT = SEQUENCE_BIT;
    private final static long DATA_CENTER_LEFT = SEQUENCE_BIT + MACHINE_BIT;
    private final static long TIMESTAMP_LEFT = DATA_CENTER_LEFT + DATA_CENTER_BIT;

    private long dataCenterId;  //数据中心
    private long machineId;     //机器标识
    private long sequence = 0L; //序列号
    private long lastTimeStamp = -1L;  //上一次时间戳

    private long getNextMill() {
        long mill = getNewTimeStamp();
        while (mill <= lastTimeStamp) {
            mill = getNewTimeStamp();
        }
        return mill;
    }

    private long getNewTimeStamp() {
        return System.currentTimeMillis();
    }

    /**
     * 根据指定的数据中心ID和机器标志ID生成指定的序列号
     *
     * @param dataCenterId 数据中心ID
     * @param machineId    机器标志ID
     */
    public SnowFlakeShortUrl(long dataCenterId, long machineId) {
        if (dataCenterId > MAX_DATA_CENTER_NUM || dataCenterId < 0) {
            throw new IllegalArgumentException("DtaCenterId can't be greater than MAX_DATA_CENTER_NUM or less than 0！");
        }
        if (machineId > MAX_MACHINE_NUM || machineId < 0) {
            throw new IllegalArgumentException("MachineId can't be greater than MAX_MACHINE_NUM or less than 0！");
        }
        this.dataCenterId = dataCenterId;
        this.machineId = machineId;
    }

    /**
     * 产生下一个ID
     *
     * @return
     */
    public synchronized long nextId() {
        long currTimeStamp = getNewTimeStamp();
        if (currTimeStamp < lastTimeStamp) {
            throw new RuntimeException("Clock moved backwards.  Refusing to generate id");
        }

        if (currTimeStamp == lastTimeStamp) {
            //相同毫秒内，序列号自增
            sequence = (sequence + 1) & MAX_SEQUENCE;
            //同一毫秒的序列数已经达到最大
            if (sequence == 0L) {
                currTimeStamp = getNextMill();
            }
        } else {
            //不同毫秒内，序列号置为0
            sequence = 0L;
        }

        lastTimeStamp = currTimeStamp;

        return (currTimeStamp - START_TIMESTAMP) << TIMESTAMP_LEFT //时间戳部分
                | dataCenterId << DATA_CENTER_LEFT       //数据中心部分
                | machineId << MACHINE_LEFT             //机器标识部分
                | sequence;                             //序列号部分
    }

    public static void main1(String[] args) {
//        SnowFlakeShortUrl snowFlake = new SnowFlakeShortUrl(2, 3);
//
//        for (int i = 0; i < (1 << 5); i++) {
//            //10进制
//            System.out.println(snowFlake.nextId());
//        }

       /* boolean a=true;
        boolean b=false;
        boolean c= a||b;
        System.out.println(c);
*/

        String amount = "-10000.23";
        System.out.println(IsMoney(amount));
    }

    public static void main(String[] args) {
        String amount = "-10000.23";
        System.out.println(IsMoney(amount));
    }


    public static boolean IsMoney(String str) {
        String regex = "^(-?[0-9]+)(.[0-9]{2})?$";
        return match(regex, str);
    }

    private static boolean match(String regex, String str) {
        Pattern pattern = Pattern.compile(regex);
        Matcher matcher = pattern.matcher(str);
        return matcher.matches();
    }
}
